“I was just talking to some White House officials this morning and their view is that the president himself wants to be the messenger, his own warrior, his own lawyer, his own spokesman,” Costa said during an appearance on MSNBC.

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“The president is expected to be tweeting on Thursday in response to Comey, not to stay quiet during the testimony, because he himself wants to be the one driving the process," Costa said.

Trump has been tweeting regularly since the weekend, directing his tweets at the mayor of London after a terror attack in the city and going after the media. He has also renewed support for his "travel ban" on several majority-Muslim countries that his administration is defending in courts and took credit for four Arab countries’ decision to cut ties with Qatar.

The president is set to speak at a conservative religious conference at 11:30 a.m. Thursday, during Comey’s testimony in front of the Senate Intelligence Committee. The hearing is scheduled to begin at 10 a.m.

Thursday's hearing is Comey's first appearance in front of Congress since Trump abruptly fired the FBI chief last month.

Comey is expected to testify about the investigation into Russian interference in the election and is expected to be asked about his past conversations with Trump, including allegations that the president asked for his loyalty and for the FBI director to ease off the investigation into Trump's first national security adviser, Michael Flynn.